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Advancing Polycyclic Aromatic Hydrocarbon Bioremediation Using Genetic Bioaugmentation in Soil Microbial Communities
Advancing Polycyclic Aromatic Hydrocarbon Bioremediation Using Genetic Bioaugmentation in Soil Microbial Communities
Detailed Information
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105205
- ISBN
- 9798290948041
- DDC
- 576
- 서명/저자
- Advancing Polycyclic Aromatic Hydrocarbon Bioremediation Using Genetic Bioaugmentation in Soil Microbial Communities
- 발행사항
- [Sl] : Rice University, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 120 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-02, Section: B.
- 주기사항
- Advisor: Stadler, Lauren.
- 학위논문주기
- Thesis (Ph.D.)--Rice University, 2025.
- 초록/해제
- 요약Polycyclic aromatic hydrocarbons (PAHs) are introduced into the environment through forest fires, fossil fuel combustion, and crude oil spills, posing significant health and ecological risks. These compounds are carcinogenic and disrupt soil microbial processes essential for ecosystem functions. Bioremediation, which uses microorganisms to degrade pollutants, can be applied to ameliorate contaminated environments. However, biodegradative functions are often limited because exogenous bacteria cannot compete with native microbes.Genetic bioaugmentation offers a promising solution by equipping native microbes with biodegradative capabilities encoded and delivered via mobile genetic elements such as plasmids. This approach leverages the adaptability and ecology of native microbial communities. I hypothesize that delivering catabolic genes on plasmids to native microbes enhances PAH removal by engaging a diverse, well-adapted bacterial community rather than relying on a single species. Previous research on genetic bioaugmentation has inadequately addressed the fitness impacts of plasmids on recipient bacteria, the range of plasmid recipients, and their effect on biodegradation rates.This thesis investigates these factors by engineering plasmids with the bphC dioxygenase gene and conjugating them to soil bacteria. Results revealed that plasmid fitness effects significantly influenced conjugation rates, community structure, and PAH biotransformation. Moreover, plasmid transfer rates were strongly associated with recipient bacterial abundance in synthetic communities. To track plasmid persistence, the pKJK5 plasmid was modified with a genetic memory biosensor. This plasmid persisted in soil microbial communities for 10 days without selective pressure and showed enhanced stability and biodegradation efficiency in the presence of a model PAH.These findings highlight the critical role of plasmid fitness effects in shaping microbial community dynamics and biodegradation efficiency. By addressing the activity and longevity of biodegradative functions at the community level, this research advances the design of effective genetic bioaugmentation strategies for PAH-contaminated environments.
- 일반주제명
- Microbiology
- 일반주제명
- Genetics
- 키워드
- Conjugation
- 키워드
- Bioremediation
- 키워드
- Dioxygenase
- 기타저자
- Rice University Civil and Environmental Engineering
- 기본자료저록
- Dissertations Abstracts International. 87-02B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■020 ▼a9798290948041
■035 ▼a(MiAaPQ)AAI32260774
■035 ▼a(MiAaPQ)0187rice5476Crosby
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a576
■1001 ▼aCrosby, Tessa Marie.
■24510▼aAdvancing Polycyclic Aromatic Hydrocarbon Bioremediation Using Genetic Bioaugmentation in Soil Microbial Communities
■260 ▼a[Sl]▼bRice University▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a120 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-02, Section: B.
■500 ▼aAdvisor: Stadler, Lauren.
■5021 ▼aThesis (Ph.D.)--Rice University, 2025.
■520 ▼aPolycyclic aromatic hydrocarbons (PAHs) are introduced into the environment through forest fires, fossil fuel combustion, and crude oil spills, posing significant health and ecological risks. These compounds are carcinogenic and disrupt soil microbial processes essential for ecosystem functions. Bioremediation, which uses microorganisms to degrade pollutants, can be applied to ameliorate contaminated environments. However, biodegradative functions are often limited because exogenous bacteria cannot compete with native microbes.Genetic bioaugmentation offers a promising solution by equipping native microbes with biodegradative capabilities encoded and delivered via mobile genetic elements such as plasmids. This approach leverages the adaptability and ecology of native microbial communities. I hypothesize that delivering catabolic genes on plasmids to native microbes enhances PAH removal by engaging a diverse, well-adapted bacterial community rather than relying on a single species. Previous research on genetic bioaugmentation has inadequately addressed the fitness impacts of plasmids on recipient bacteria, the range of plasmid recipients, and their effect on biodegradation rates.This thesis investigates these factors by engineering plasmids with the bphC dioxygenase gene and conjugating them to soil bacteria. Results revealed that plasmid fitness effects significantly influenced conjugation rates, community structure, and PAH biotransformation. Moreover, plasmid transfer rates were strongly associated with recipient bacterial abundance in synthetic communities. To track plasmid persistence, the pKJK5 plasmid was modified with a genetic memory biosensor. This plasmid persisted in soil microbial communities for 10 days without selective pressure and showed enhanced stability and biodegradation efficiency in the presence of a model PAH.These findings highlight the critical role of plasmid fitness effects in shaping microbial community dynamics and biodegradation efficiency. By addressing the activity and longevity of biodegradative functions at the community level, this research advances the design of effective genetic bioaugmentation strategies for PAH-contaminated environments.
■590 ▼aSchool code: 0187.
■650 4▼aMicrobiology
■650 4▼aEnvironmental engineering
■650 4▼aGenetics
■653 ▼aGenetic bioaugmentation
■653 ▼aConjugation
■653 ▼aPolycyclic aromatic hydrocarbons
■653 ▼aBioremediation
■653 ▼aDioxygenase
■690 ▼a0775
■690 ▼a0410
■690 ▼a0369
■71020▼aRice University▼bCivil and Environmental Engineering.
■7730 ▼tDissertations Abstracts International▼g87-02B.
■790 ▼a0187
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17359731▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
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